首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3770656篇
  免费   308786篇
  国内免费   14111篇
耳鼻咽喉   52004篇
儿科学   119660篇
妇产科学   95913篇
基础医学   593335篇
口腔科学   101171篇
临床医学   345327篇
内科学   669935篇
皮肤病学   96220篇
神经病学   316139篇
特种医学   150604篇
外国民族医学   348篇
外科学   582903篇
综合类   111123篇
现状与发展   24篇
一般理论   2336篇
预防医学   319931篇
眼科学   87128篇
药学   259823篇
  24篇
中国医学   10245篇
肿瘤学   179360篇
  2021年   55478篇
  2020年   35256篇
  2019年   58329篇
  2018年   72570篇
  2017年   55224篇
  2016年   60896篇
  2015年   74745篇
  2014年   109081篇
  2013年   174205篇
  2012年   101046篇
  2011年   103668篇
  2010年   120060篇
  2009年   122850篇
  2008年   89705篇
  2007年   95025篇
  2006年   104153篇
  2005年   99787篇
  2004年   101523篇
  2003年   92221篇
  2002年   81469篇
  2001年   125786篇
  2000年   119677篇
  1999年   114323篇
  1998年   67808篇
  1997年   64760篇
  1996年   62987篇
  1995年   58652篇
  1994年   52544篇
  1993年   49088篇
  1992年   82790篇
  1991年   81121篇
  1990年   77541篇
  1989年   76048篇
  1988年   70325篇
  1987年   69044篇
  1986年   65154篇
  1985年   64828篇
  1984年   56610篇
  1983年   50922篇
  1982年   44360篇
  1981年   41562篇
  1980年   39258篇
  1979年   48036篇
  1978年   40654篇
  1977年   36166篇
  1976年   33917篇
  1975年   33783篇
  1974年   35784篇
  1973年   34270篇
  1972年   31916篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
66.
67.
68.

Background

Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).

Methods

All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.

Results

Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.

Conclusion

Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system.  相似文献   
69.
Purpose/aim: To focus on current aspects of primary thyroid lymphoma (PTL), which is a rare clinical entity usually manifested by a rapidly growing mass in the neck that can cause pressure symptoms.

Materials and Methods: Relevant papers in PubMed published through June 2017 were selected to track updated information about PTL with an emphasis on diagnosis and novel therapeutic management.

Results: The most frequent cases include non-Hodgkin lymphoma derived from B-cells, mainly diffuse large B-cell lymphoma (DLBCL) followed by mucosa-associated lymphoid tissue (MALT) lymphoma or a mixed type. Other subtypes are less common. Lymphomas derived from T-cells and Hodgkin lymphomas are extremely rare. Hashimoto's autoimmune thyroiditis has been implicated as a risk factor for lymphoma. At the molecular level, the Wnt5a protein and its receptor Ror2 are involved in the course of the disease. Ultrasonography, fine needle aspiration (FNA) biopsy, and core or open biopsy combined with new diagnostic facilities contribute to an accurate diagnosis. An increased potential exists for a cure without the need for a radical surgical procedure. Modern chemoradiation therapy plus the monoclonal antibody rituximab, which acts against CD20, have limited the need for surgical interventions and provide an excellent outcome in most cases. However, some cases have resulted in treatment failure or recurrence.

Conclusions: A multidisciplinary approach must be used to define the management policy in each case. Future efforts by researchers are likely to be focused on the molecular level.  相似文献   

70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号